The aftermarket AEs are on the 4.6iS and those were hardwired to the get the juice via a relay once the engine was on.

I am working on the 4.8iS, facelifted 2006 model, the AEs here are factory. this is the one I am playing with the programming.

I am done with the 4.6iS, no more mods there - all my efforts are now concentrated on the new ride... lol...

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E53 X5 4.6iS
147K mi - Sold May 2013
Tireprints left in:
USA, Nicaragua, Costa Rica, Panama, Russia

E53 X5 4.8iS built 2005-10-17
66200 mi - June 2012
96000 mi - June 2013
112000 mi - June 2014
OEM fire extinguisher
OE first aid kit
OE tow hitch
OE TV module
OE aspheric mirror
K&N air filter
black/white badges
rear camera
4-channel video recorder

Here is the list of things I have done to the X